Debbie McKinnon has said how proud to be mother-in-law to both of her son’s partners (Picture: Daily Record)

A Scottish mum who was devastated when her son’s husband had a boyfriend has spoken of how ‘beautiful’ she thinks their polyamourous relationship is.

Debbie McKinnon, 45, was overjoyed when her son Ross, 27, announced he was going to marry his long term boyfriend Iain Waddell, 33, but she was horrified to discover a third man, Iain’s boyfriend Pav, would be joining their relationship.

Pav Gill, 24, moved into their two-bed flat in Edinburgh just three days before Ross and Iain married, and Debbie said she was worried that the new man would steal her son’s new husband from him.

But three years later the three men are completely devoted to each other, and Ross is now also dating Pav after falling in love with him.

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Debbie told the Daily Record: ‘I was worried my baby was going to be lying in bed alone at night, crying because his partner was in the next room sleeping with some other bloke.

‘But Ross explained that while Iain and him had a deep, deep love, it didn’t mean they didn’t want to have sex or relationships with other people. He told me the feelings Iain had for Pav didn’t diminish their relationship.’

Ross, Iain and Pav( pictured in Madrid) are in a polyamourous relationship and all live together (Picture: Ross McKinnon)

Pav was at the wedding at Edinburgh Castle in 2014 when Ross and Iain exchanged vows, and now Debbie says she is proud to be mother-in-law to both Iain and Pav.

Ross and Iain, who are both nurses, met through a dating app seven years ago and decided to have an open relationship where each man could date other people.

Just months after the couple got engaged, Iain met Pav from Coventry who applied to be a student in the city.

When Iain and Ross returned from their honeymoon, Pav and Ross initially didn’t get on but slowly started to become friends.

Iain said: ‘We are in a three-way relationship where Ross and I are married, and Pav is our boyfriend. Lots of people assume that being in a poly relationship is all about sex but sex is not the be all and end all – we are not a harem.’

Ross added that although they all live together they don’t all sleep in the same bed and they will take it turns to spend nights together.

He said that before meeting Iain he had never considered polyamory, but his eyes were opened and he realised being polyamorous wasn’t cheating on your partner, as there is no deception or dishonesty.

He said: ‘When I try to explain to other people what it means, I tell them you can have love in your heart for many people. Now, I look at people who only love one partner and I really feel quite sad for them that they are so limited.’